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  <div id="layout-content"><div id="syncsemaphore.lock" class="refentry">
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  <h1 class="refname">SyncSemaphore::lock</h1>
  <p class="verinfo">(PECL sync &gt;= 1.0.0)</p><p class="refpurpose"><span class="refname">SyncSemaphore::lock</span> &mdash; <span class="dc-title">Decreases the count of the semaphore or waits</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-syncsemaphore.lock-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>SyncSemaphore::lock</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$wait</code><span class="initializer"> = -1</span></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Decreases the count of a <span class="classname"><a href="class.syncsemaphore.html" class="classname">SyncSemaphore</a></span> object or waits until the semaphore becomes non-zero.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-syncsemaphore.lock-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt>
<code class="parameter">wait</code></dt>

    <dd>

     <p class="para">
      The number of milliseconds to wait for the semaphore.
      A value of -1 is infinite.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-syncsemaphore.lock-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>， 或者在失败时返回 <strong><code>false</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-syncsemaphore.lock-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-3361">
   <p><strong>示例 #1 <span class="function"><strong>SyncSemaphore::lock()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$semaphore&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SyncSemaphore</span><span style="color: #007700">(</span><span style="color: #DD0000">"LimitedResource_2clients"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /><br />if&nbsp;(!</span><span style="color: #0000BB">$semaphore</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">lock</span><span style="color: #007700">(</span><span style="color: #0000BB">3000</span><span style="color: #007700">))<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Unable&nbsp;to&nbsp;lock&nbsp;semaphore."</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></span><span style="color: #FF8000">/*&nbsp;...&nbsp;*/<br /><br /></span><span style="color: #0000BB">$semaphore</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">unlock</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-syncsemaphore.lock-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li class="member"><span class="methodname"><a href="syncsemaphore.unlock.html" class="methodname" rel="rdfs-seeAlso">SyncSemaphore::unlock()</a> - Increases the count of the semaphore</span></li>
  </ul>
 </div>


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